Working in retail for 15+ years I saw just about all of that happening on a weekly basis. My district manager used to get out a measuring tape to see if we could move the isle shelving closer together... um what about the larger wheelchairs or electric chairs, they won't fit. "Handicap Accessible" seems to be a joke or the punchline, not something taken seriously.
It floors me that common courtesy is just ignored. Visible or invisible, handicap people are just that people; not exhibits, not a moral, just people who are trying to live their lives.